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现行 ASTM D2918-99(2020)
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Standard Test Method for Durability Assessment of Adhesive Joints Stressed in Peel 胶带粘合剂接头的耐久性评估标准试验方法
发布日期: 2020-12-15
1.1 本试验方法通过在不同温度下与空气接触、与某些溶液平衡的空气、水、水溶液或其他环境中施加应力的T型剥离试样,提供了评估粘接接头耐久性的数据。 1.2 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.3 本标准并非旨在解决与其使用相关的所有安全问题(如有)。本标准的用户有责任在使用前制定适当的安全、健康和环境实践,并确定监管限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒(TBT)委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 4.1 应力和水分的结合会降低大多数粘接接头的耐久性。存在水或水蒸气时的应力可能导致一些粘接接头在断裂干接头所需应力的一小部分处失效。给定粘接接头的失效时间通常随应力、温度和相对湿度的增加而减少。 4.2 该试验方法可用作评估粘接接头耐久性的加速筛选试验。它可用于测量暴露在室外的粘接接头的耐久性,或测量粘接接头在使用中所经历的环境条件。它还可用于确定各种表面处理或基材对粘接接头耐久性的影响。 4.3 在统一的条件下,使用本试验方法可以比较各种粘合剂的耐久性能。 为了评估给定粘合剂的整体耐久性,应在应力、相对湿度和温度范围内测试T形剥离接头。对于特定的最终用途,仅使用一组测试条件就可能获得所需的耐久性数据。
1.1 This test method provides data for assessing the durabilities of adhesive joints by means of T-peel type specimens stressed in contact with air, air in equilibrium with certain solutions, water, aqueous solutions, or other environments at various temperatures. 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 4.1 The combination of stress and moisture decreases the durability of most adhesive joints. Stresses in the presence of water or water vapor may cause some adhesive joints to fail at some small fraction of the stress required to break the dry joint. The time to failure for a given adhesive joint generally decreases with increasing stress, temperature, and relative humidity. 4.2 This test method may be used as an accelerated screening test for assessing the durability of adhesive joints. It may be used to measure durability of adhesive joints exposed outdoors or to environmental conditions experienced by adhesive joints in service. It may also be used to determine the effects of various surface preparations or substrates on durabilities of adhesive joints. 4.3 The durability performance of various adhesives may be compared by using this test method under uniform sets of conditions. To assess the overall durability of a given adhesive, T-peel joints should be tested under a range of stress, relative humidity, and temperature. For a specific end use it may be possible to obtain the needed durability data using only one set of test conditions.
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归口单位: D14.80
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